SciELO - Scientific Electronic Library Online

vol.25 número2Movimiento del agua en Argiudoles de la Pampa Ondulada con diferente mineralogía de arcillas índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados



  • No hay articulos citadosCitado por SciELO

Links relacionados

  • No hay articulos similaresSimilares en SciELO


Ciencia del suelo

versión On-line ISSN 1850-2067


PICONE, Liliana et al. Phosphorus transfomations in a mollisol under contrasting tillage practices. Cienc. suelo [online]. 2007, vol.25, n.2, pp. 99-107. ISSN 1850-2067.

Conservation tillage may affect soil phosphorus (P) fractions through the application of P fertilizer and the deposition of residue on the soil surface. The objectives were to 1) evaluate the effect of tillage systems on soil P fractions, as well as the interaction with P fertilization, and 2) relate changes in P fractions with P balance. No tillage and conventional tillage were assigned as main plots and the two P rates (0 y 30 kg P ha-1) the subplots, with three replicates. Inorganic (Pi) and organic (Po) P were measure with the anion exchange membrane (AEM), NaHCO3, NaOH, HCl and residual fractions, extracted sequentially. When the amount of P applied exceeded that removed by grain, the P excess was converted to different fractions, but with no increases in Bray-P compared to initial value. In the short time, there was no interaction neither significant effect of tillage systems on Pi forms; however, the AEM-Pi and NaHCO3-Pi fractions were significantly (p< 0,05) higher with P application. Without consideration of residual-P and among the inorganic forms, the HCl-Pi showed high values, in absolute (50 mg P kg-1) and relative (9% of total P) terms, according to geochemical characteristics of these soils. There was no interaction of fertilizer application with tillage neither main effects on Po fractions. Among all P fractions, NaOH-Po was the most abundant (186,7 mg P kg-1 and 34% of total P), followed by residual-P. In agreement with the positive P balance, total P tended to be higher with P application and the sum of fractions extracted by AEM, NaHCO3, NaOH y HCl accounted, on average, for 81% of the increment in total P.

Palabras clave : Sequential phosphorus fractionation; Phosphorus balance; No tillage; Conventional tillage.

        · resumen en Español     · texto en Español     · Español ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License